fix: initialize useKeyboard from current keyboard state

[huytdps13400]

Summary

• initialize keyboardShown, coordinates, and height from React Native keyboard state when the hook mounts
• use optional Keyboard.isVisible() / Keyboard.metrics() calls so RN 0.70–0.75 consumers keep the existing closed-state fallback
• always clear keyboard height on keyboardDidHide, including events that contain coordinates
• restore the repository Jest/lint harness against its declared RN 0.78 and React 18 dependencies so the regression is executable

The tooling repair is isolated in the first commit; the behavior change, tests, and patch changeset are in the second.

Test plan

• RED: three new assertions failed on main (initial height, initial visibility, and non-null hide-event height reset)
• bun install --frozen-lockfile
• bun run test --runInBand --silent: 45/45
• bun run typecheck
• bun run lint
• Prettier check on every changed source/config file
• git diff --check

Fixes #400

[changeset-bot]

🦋 Changeset detected

Latest commit: fb8c36d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@react-native-community/hooks	Patch

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